Method of creating map data
First Claim
1. A computerised method of creating map data, comprising:
- processing, using a processor, sets of position data derived from the positions of a plurality of mobile devices moving along a section of road having two or more lanes with same direction of travel, wherein each set of position data comprises a plurality of points representative of the position of a mobile device over a period of time, and wherein the processing of a set of position data comprises;
determining an offset value for each point, the offset value being the distance between the point and a predetermined reference line; and
determining a variance of the offset values for the points in the set;
filtering the sets of position data by removing or reducing the weight applied to sets of position data having a variance above a predetermined value to generate filtered position data, said filtering further comprising comparing altitude information associated with one or more points in the sets of position data to a previously determined height for the one or more points, and removing or reducing the weight applied to sets of position data if the altitude information varies by more than a predetermined amount from the previously determined height;
deriving information about lanes of the road based upon the filtered position data; and
generating map data using the derived information.
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Accused Products
Abstract
A computerised method of creating map data from a plurality of trips where each trip comprises position data derived from the positions of at least one navigation device 200 over a period of time, the method comprising using a processing circuitry to perform the following steps: i. processing the position data; ii. determining from the processing the believed accuracy of the position data constituting a trip; iii. reducing the weight applied to and/or removing position data in which the belief is below a predetermined threshold to generate filtered position data; iv. deriving information about the road 700 based upon the filtered position data; and v. generating further map data.
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Citations
11 Claims
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1. A computerised method of creating map data, comprising:
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processing, using a processor, sets of position data derived from the positions of a plurality of mobile devices moving along a section of road having two or more lanes with same direction of travel, wherein each set of position data comprises a plurality of points representative of the position of a mobile device over a period of time, and wherein the processing of a set of position data comprises; determining an offset value for each point, the offset value being the distance between the point and a predetermined reference line; and determining a variance of the offset values for the points in the set; filtering the sets of position data by removing or reducing the weight applied to sets of position data having a variance above a predetermined value to generate filtered position data, said filtering further comprising comparing altitude information associated with one or more points in the sets of position data to a previously determined height for the one or more points, and removing or reducing the weight applied to sets of position data if the altitude information varies by more than a predetermined amount from the previously determined height; deriving information about lanes of the road based upon the filtered position data; and generating map data using the derived information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A machine arranged to create map data, comprising at least one processor arranged to:
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process sets of position data derived from the positions of a plurality of mobile devices moving along a section of road having two or more lanes with same direction of travel, wherein each set of position data comprises a plurality of points representative of the position of a mobile device over a period of time, and wherein the processing of a set of position data comprises; determining an offset value for each point, the offset value being the distance between the point and a predetermined reference line; and determining a variance of the offset values for the points in the set; filter the sets of position of data by removing or reducing the weight applied to sets of position data having a variance above a predetermined value to generate filtered position data, said filtering further comprising comparing altitude information associated with one or more points in the sets of position data to a previously determined height for the one or more points, and removing or reducing the weight applied to sets of position data if the altitude information varies by more than a predetermined amount from the previously determined height; derive information about lanes of the road based upon the filtered position data; and generate map data using the derived information.
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11. A non-transitory machine readable medium containing instructions which when read by a machine cause that machine to perform the method of creating map data, the method executed by the set of instructions comprising:
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processing sets of position data derived from the positions of a plurality of mobile devices moving along a section of road having two or more lanes with same direction of travel, wherein each set of position data comprises a plurality of points representative of the position of a mobile device over a period of time, and wherein the processing of a set of position data comprises; determining an offset value for each point, the offset value being the distance between the point and a predetermined reference line; and determining a variance of the offset values for the points in the set; filtering the sets of position data by removing or reducing the weight applied to sets of position data having a variance above a predetermined value to generate filtered position data, said filtering further comprising comparing altitude information associated with one or more points in the sets of position data to a previously determined height for the one or more points, and removing or reducing the weight applied to sets of position data if the altitude information varies by more than a predetermined amount from the previously determined height; deriving information about lanes of the road based upon the filtered position data; and generating map data using the derived information.
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Specification